In the ad, the president says Koster will work to “protect the Affordable Care Act from Republicans working to take folks’ insurance away. He’ll finally expand Medicaid in Missouri, giving more folks the financial security of health care.”

Obama goes on to say Koster will fight for public education and to raise the minimum wage, before concluding with: “My name might not be on the ballot this year. But all the progress we’ve made together sure is. Chris Koster will build on that progress, not roll it back.”

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Greitens campaign quickly sent out a statement, saying the ad is evidence that Koster is “just another liberal, big-government Democrat politician like Hillary Clinton and Barack Obama.”

Recent polling has shown the Greitens-Koster race is neck-and-neck heading into Tuesday’s election. Greitens’ strategy of late has been to link Koster to the top of the Democratic ticket, since Hillary Clinton is expected to lose to Donald Trump in Missouri and Obama lost Missouri in 2012 by nine percentage points (although he lost in 2008 by less than 4,000 votes).

Koster faced a similar strategy in 2012, when the Republican running against him for attorney general tried to tie him to the top of the ticket by repeatedly referring to him as “Obama’s lawyer.” He won re-election that year by 15 percentage points.

When he’s been asked about Clinton’s candidacy, Koster always notes that there are many things he disagrees with her on but that he still supports her candidacy. He told the St. Louis American that among his reservations about Clinton are that “I wish she were a warmer candidate, or something – whatever the word is that everybody knows, but nobody can put their finger on.